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Vince911

06 yzf450 Help cant Figure it out.

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So my customer brought in an 06yzf450. It acts like its running really lean. Backfiring, popping, shooting flames. With a minute or less its hot. I changed the gas. Changed the jetting. Adjusted the valves. Correct timming. Checked for an air leak. I can not figure it out. Nothing seemed to help. He does not want me to pull the head due to money. There is a rattle you can hear from time to time you can when kicking it over. So im sure its about to go. Any ideas or suggestions would be helpful.

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Not to second guess but I would check the valve clearence again. Just sounds like the symptoms. Have you checked out the exhaust packing?

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Have you checked to make sure that the idle circuit is working properly? Have you cleaned or replaced the pilot jet?

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Checked and adjusted hot start and enrichner.

Replace the o ring gasket on the slide plate and make sure the plate intself isn't cracked. Use a magnifying glass and make sure! I have fixed several yz's that have had the same problem, and also make sure the acc pump nozzle is squirting fuel!

Edited by CROGGR

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